8/13/2019 Safety Wheel Nut Installation

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Check for damaged studs and stripped stud threadsas evidenced by shiny threads.

Replace any parts that exhibit wear or damage.

Ensure replacement studs are the proper ones forthe system used. Stud breakage can occur if the

wrong studs are used. If a stud is broken, replace it and the stud on each

side of the broken one. If two or more studs are

broken, replace them all. Use a press to install thestuds and be sure the hub flange is supported. Stud

heads can be bent from hammer blows, which will

prevent the stud from seating properly, and canresult in stud failure.

NOTE: DISC-LOCK Safety Wheel Nuts are coated withGeomet Coating, a completely chromium-free coating

(no Hexavalent and no Trivalent chromium). 720 hourssalt spray corrosion protection, far surpassing the indus-

try standard of 96 hours.

CAM RISE ANGLEUnlike conventional wheel nuts for

hub-piloted wheels, DISC-LOCK Safety Wheel Nuts are

made with interlocking cams on the underside of the nutcomponent and top side of the hex flange washer. The

angle of the cams is greater than the pitch angle of the

threads on the stud, therefore under road shock and

vibration, a wedging action takes place and the DISC-LOCK Safety Wheel Nut locks and will not come loose,

thus keeping the wheel on the axle.

Aluminum hubs require different stud installationprocedures. Consult the manufacturer for recom-

mendations.

Use correct nuts. Nuts used for stud-pilotedsystems cant be used in hub-piloted systems. Hub-

piloted wheels use flange nuts for both single and

dual wheel applications. No inner cap nuts arerequired.

Check the wheel nuts and ensure that multi-piece

nuts turn smoothly on their flanges. Discard all nutswith damaged threads and those that fail to turn

smoothly. Apply two drops of 30 weight oil to a point between

the nuts and flanges and two drops to the last 2 or 3

threads at the end of each stud. Also lightlylubricate the pilots on the hub to ease wheel

installation and removal. Do not get lubricant on the

mounting face of the drum or wheel.

NOTE: DO NOT APPLY OIL TO ANY PART OF THE

DISC-LOCK SAFETY WHEEL NUT.

NOTE: The use of anti-seize compounds is notrecommended for this application.

DISC WHEEL INSTALLATION PROCEDURES

DISC WHEEL INSTALLATION PROCEDURE

HUB-PILOTED DISC WHEEL SYSTEM

1. Check all parts for damage.Hub:

The hub mounting face must be cleaned and keptflat. Look for worn or damaged mounting faces by

using a straight edge.

Clean hub mounting surface and hub pilots with awire brush if rust, dirt, paint, grease or debris is

present.

Note the condition of the hub and the hub pilots.Replace the hub if a worn hub face is evident or if

the hub pilots are worn or broken.

Drum: The drum mounting face must be cleaned, free of

dirt, paint, and grease and kept flat. Look for worn or damaged mounting faces by using

a straight edge.

Clean the drum surface with a wire brush if rust ordebris is present.

Ensure the brake drum is positioned on the raised

step of the hub pilots and is seated fully against thehub.

Replace the drum if it exhibits a worn mounting

face, or cracked bolt holes.Wheels:

Ensure that wheel mounting faces are free of dirt

and grease. Be sure the wheels are hub-piloted wheels with

bolt holes drilled straight through without ballseats. Stud-piloted wheels must not be used as

substitutes for hub-piloted wheels under any

circumstance. Never try to use a hub-pilotedwheel with a stud-piloted hub or stud-piloted nuts.

The result could be torque loss, a cracked wheel,

or possible wheel loss. Make sure the center hole of the wheel is clean so

it will fit easily on the hub pilots.

Look for worn or damaged mounting faces by usinga straight edge.

Replace any wheel that exhibits wear or damage. Look for damaged metal at bolt and center holes.

Studs and Nuts:

Ensure that studs and nuts are free of dirt and

grease. Wire brush the base of each stud and threads to

remove any rust or foreign material that could bindup the wheel nuts.

DISCLAIMER: This Poster Chart is based on TMC RP

222B, Users Guide to Wheels and Rims, and the

consensus of the members of the Technology & Main-tenance Council (TMC) on those items and methods

that have delivered the best performance record based

on the experience of those present at meetings of the

Council. The procedures contained herein are not

exclusive. TMC cannot possibly know, evaluate, or

advise the transportation industry of all conceivable

ways in which a practice may be undertaken or of thepossible consequences of each such practice. Other

practices or methods may be as good, or better, de-

pending upon the particular circumstances involved.All who use the procedures contained herein must first

satisfy themselves thoroughly that neither the safety of

their employees or agents, nor the safety or usefulness of

any products, will be jeopar-

dized by any method selected.

The following procedures are

not intended nor should they

be construed as an endorse-

ment of any particular person,

organization, or product.

Technology & MaintenanceCouncil of American Trucking

Associations, Inc., 2004

Published by:

Technology &

Maintenance Council

950 N. Glebe Road

Arlington, VA 22203

(703) 838-1763

1

3

7 4

6

8

5

2

1

3

7

10

4

6

8

9

5

2

Pilot

Fig. 1: Nut Tightening

Sequence for Hub-Piloted

Disc Wheels

NOTE: This poster is based upon TMCs Wheel Installa-

tion Wall Chart, and includes information specific for

installation and service of Disc-Lock Safety Wheel Nuts

on hub-piloted disc wheels. Information exclusively per-

tinent to Disc-Lock Safety Wheel Nuts appears in black

boxes in white type. This poster does not constitute or

imply any endorsement of DISC-LOCK or other products.

I N T E R N A T I O N A L

Mounting Type Nut ThreadTorque Level

Ft.-Lb. *(Oiled)

Hub-pilotedwith flange nut

11/16" - 16M20 x 1.5

M22 x 1.5

300-400280-330

450-500

11/16"-16 300-400

M20 X 1.5 280-330

M22 X 1.5 450-500

7/8 - 14 350-400

* OiledApply two drops of oil to a point between the nut and flange

and two drops to the two or three threads at the end of each stud.

NOTE: If using specialty fasteners, consult the manufacturer for

recommended torque levels.

Do not apply oil to any part of the Disc-Lock Safety Wheel Nut.

Stud-piloted,double cap nut

Standard type

(7/8" radius)

3/4" - 16

1 -1/8" - 16

450-500

450-500

Stud-piloted,

double cap nutHeavy-duty type

(1-3/16" radius)

15/16" - 12

1-1/8" - 16

1-5/16" - 12

750-900

750-900

750-900

Size Disc-Lock

Part Number

Installation Torque

(oiled) Ft.-Lb.**

7/8" - 14 UNF NSF-2090-S-GEO 500-550

M22 X 1.5 NMF-2090-M-GEO 500-550

** The above torque levels for Disc-Lock Safety Wheel Nuts are

for usage with Grade 8 (Class 10.9 Metric) wheel studs only.

RECOMMENDED MOUNTING TORQUEFOR DISC-LOCK SAFETY WHEEL NUTS

TABLE 1RECOMMENDED MOUNTING TORQUE

FOR DISC WHEELS

FOR DISC-LOCK SAFETY WHEEL NUTS

*Clean center hole of wheels and lube pilots on hub to help seat wheels.

Use only 6-point, flat-faced (without bevel), flanked

sockets to install and remove DISC-LOCK Safety WheelNuts (sockets available from DISC-LOCK.)

IMPORTANT: DISC-LOCK recommends DISC-LOCK SafetyWheel Nut usage in COMPLETE WHEEL SETS ONLY (i.e.,

eight DISC-LOCK Safety Wheel Nuts on an eight-hole mount

and 10 DISC-LOCK Safety Wheel Nuts on a 10-hole mount.

2. Rotate the hub so

that one pilot is atthe 12 oclock

position. Place thesingle wheel or the

inner dual wheel

onto the hub beingcareful not to

damage studthreads. Make surethe wheel is fully

seated against the

drum.3. For dual wheels,

place the outer wheel

onto the hub makingsure the hand holes

are lined up for easyaccess to the tire

valves. Make sure the

outer wheel ispushed fully up

against the inner

wheel. Install nuts finger-tight at the 12 oclock positionand then at the 6 oclock position, then apply nuts finger-

tight to the remaining studs. Snug the nuts to about 50 ft.

lbs. following a crisscross sequence as shown in Fig. 1.Finally tighten all the nuts to the recommended torque

(See Table 1) using the same crisscross sequence.4. After the wheels are installed, check to see that both

wheels are still seated on the pilots and are flat against

the drum. This can be done by inspecting the seating ofthe wheels on all four pilots and by turning the wheels

and checking for wheel assembly irregularity.

5. After a wheel assembly has been installed, recheck thetorque level between 50 and 100 miles of operation and

retighten if necessary to the recommended torque

using the proper sequence. It is recommended that atorque check be made as part of a vehicles scheduled

maintenance program or at 10,000 mile intervalswhichever comes first. Individual fleet experience may

dictate shorter intervals or allow longer intervals.

6. If air wrenches are used, they must be periodicallycalibrated for proper torque output. Use a torque

wrench to check the air wrench output. If output is notcorrect, take the necessary steps to adjust output. (SeeAir System and Impact Wrench Maintenance section

for more details.) Air System and Impact Wrench

Maintenance section in TMCs Users Guide to Wheelsand Rimsfor more details.)

I N T E R N A T I O N A L

L E A D I N G I N N O V A T O R S I N F A S T E N E R T E C H N O L O G Y

Compliments ofDISC-LOCK International6101 W. Centinela Avenue,Suite 280

Culver City, CA 90230 USA

For further information

and prices contact

DISC-LOCK INTERNATIONAL

Tel: (310) 944-9352

Fax: (310) 944-9522http://www.disc-lock.com

www.disc-lock.com